738 Obdeb 158.— CTPEEACEiE. 



narrowly linear, striate; sheath close, traneale; spike oblong-ovate, 3 — 5" in 

 length, 20 — 30-flowered ; glumes ovate-lanoeolate, acute, mostly 2-cleft at apex, 

 dark purple on the back, with a broad, scarious margin; bristles ; aeh. obovate- 

 pyriform, shining, minutely punctate, of a light, shining yeUow, the minute tubercle 

 fuscous. — ^Wet places N. T. to 111. 



17 E. acioularis E. Br. Culm leafless, setaceous, quadrangular, very slender, 

 3 — 6' high; spike compressed, oblpng-ovate, acute, 4 — 8-flowered; glumes ob- 

 tusish, the lowest one larger and empty ; ach. oiovoid, triangular, striated length- 

 wise. — Edges of ponds, often partly submersed, U. S. and Brit. Am. Tery deli- 

 cate. June, July. 



18 B. pigmaea Torr. Oidm 1 — 2' high, setaceous, cooipressed, sulcate; spikes 

 ovate, compressed, 3 — 6-fld. ; gl. mostly empty ; bristles 6, longer than the 

 achenium, slender, scabrous backwards; ach. ovate, acute, triangular, smooth, not 

 striate, whitish and shining ; tubercle minute. — Sea coast, Mass., to Fla. and La. 



19 B. microcarpa Torr. Culm capillary, 4-angled, 5 to 8' long; spike oblong, 

 compressed, 10 to 20-flowered, about 2" long, often proliferous; glumes ovate, 

 aoutish, keeled, chestnut brown, the lowest much the largest, bristles 3 to 5, 

 shorter than the achenium which is minute, smooth, whitish, with a very minute 

 tubercle. — Wet places, N. J., also La. 



SO B. prolifera Torr. Culms capillary, 4rangled and furrowed, 4 to 12' long, in 

 dense tufts ; spilce minute, 1 to 2" long, compressed, 4 to 6-flowered ; glumes ovate, 

 chestnut brown, with scarious margins, often proliferous, that is, producing new 

 culms instead of flowers ; bristles 3 or 4, much shorter than the achenium which 

 is 3-angled and with a broad, depressed tubercle. — Fla. ! to La. (Hale). (Chseto- 

 'Cyperus Baldwinii Torr.) 



6. SCIR'PUS, L. CLUB-EtrsH. BuLLRtrsH. (Celtic cirs, the general 

 name for rushes.) Glumes imbricated on all sides ; perigynium of 3 — 6 

 bristles, persistent ; sty. 2 — 3-cleft, not tuberculate at base, deciduous ; 

 achenium biconvex or triangular. — 2f Stems mostly triquetrous, simple, 

 rarely leafless. Spikes solitary, conglomerated or corymbous. 



§ SoiEPUs. Bristles retrorsely denticulate, about equaling the achenium. (*) 



* Spike single, terminal, with a short, ferect bract at its base Nos. 1— S 



* Spikes several or many clustered on" each culm, (a) 



a Clusters of spikes lateral — on the terete, leafless culm Nos. 4, 5 



^on the triangular culm Nos, 6 — 8 



a Clustersof spikes terminal, mostly umbellate, (b) 



b Glumes lacorately S-toothed. Spikes large (9 to 12" long) Nos. 9,10 



b Glumes entire. — Spikes small (1"), collected in globular heads. ...Nos. 11, 12 



— Spikes small (2 to 8" long), separate No. IS 



§ TKloOPnoBUM. Bristles 6, tortuous, tawny, much longerlthan the achenium, and 

 exserted. Stem (culm) l^fy. Umbel decompound \ Nos. 14, 15 



.1 S. planifdlius Muhl. Oulm ccespitous, leafy at base, acutely and roughly 3- 

 angled, 5 — 10' high; Ivs. broad-linear, flat, rough oa tlie margin, equaling the 

 stem ; spilce oblong-lanoeolate, compressed, terminal, 4 — 8-flowered ; glumes ovate- 

 mucronate, yellowish ; bracts at the base of the spike, cuspidate, outer ones longer 

 than the spike ; ach. reddish-brown, invested with 6 bristles longer than itself. — 

 In cold, hard soils, Mass. (Bobbins), N. Y. to Del. June. 



:2 S. subterminalis Torr. Oulm floating, fwrrowed, inflated, leafy below, 1 to 3f 

 long ; Ivs. very narrow, almost capillary, 2 to 4f long ; spilce somewhat terminal 

 {tile stem being continued above it in the form of a bract), lanceolate ; style 2-cleft ; 

 bristles 6.— Streams, &c., Mass. to N. T., Mich. Aug. 



■ 3 S. c^spit6Bus L. Oidm ccespitous, round, sheathed at base with numerous rw 

 diments of leaves ; spikes compressed, terminal; 2 lower glumes involucre-like, as 

 long as the spike; ach. with 6 bristles. — Grows in dense tufts, 4 — 12' high. Spike 

 4 — 5-flowered, reddish-brown. On the alpine summits of Mts., N. States. Jl. 

 4 S. debilis Pursh. Cutim caspitous, roundish, deeply striate, 9 to 16' high, with 

 a few subulate leaves at ba-se; spikelets about 3, short-ovoid, sessile, crowded, 

 lateral, the cuhn continuing a fourth of its length above them, glumes ovate, obtuse, 

 carinate, pale green; ach. obovate, mucronate; bristles 4 or 5. — ^Borders of pond* 

 and rivulets, N. Eng. to Car. Aug. 



